01 - In a small saucepan over medium heat, whisk pumpkin purée, milk, brown sugar, cinnamon, ginger, nutmeg, and cloves. Heat until hot but not boiling, whisking frequently.
02 - Remove from heat and stir in vanilla extract.
03 - Froth the spiced pumpkin milk using a milk frother or immersion blender until creamy and foamy.
04 - Divide hot espresso evenly between two large mugs.
05 - Pour the spiced pumpkin milk over espresso, holding back foam with a spoon, then spoon foam on top. Optionally top with whipped cream and sprinkle with cinnamon or pumpkin pie spice. Serve immediately.